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MODEL GLH SIZES 072-120, GLV SIZES 080-300
WATER SOURCE HEAT PUMP SPECIFICATIONS
Rev. Sept. 24, 2008
General:
Furnish and install ClimateMaster “Genesis” Water Source Heat Pumps, as indicated on the
plans. Equipment shall be completely assembled, piped and internally wired. Capacities and
characteristics as listed in the schedule and the specifications that follow.
Horizontal / Vertical Water Source Heat Pumps:
Units shall be supplied completely factory built for an entering water temperature range from 20°
to 110°F (-6.7° to 43.3°C) as standard. Equivalent units from other manufacturers can be
proposed provided approval to bid is given 10 days prior to bid closing. All equipment listed in
this section must be rated and certified in accordance with American Refrigeration Institute /
International Standards Organization (ARI / ISO) and Environmental Testing Laboratories for
United States and Canada (ETL-US-C). The units shall have ARI / ISO and ETL-US-C labels.
All units shall be fully quality tested by factory run testing under normal operating conditions as
described herein. Quality control system shall automatically perform via computer: triple leak
check, pressure tests, evacuate and accurately charge system, perform detailed heating and
cooling mode tests, and quality cross check all operational and test conditions to pass/fail
criteria. Units tested without water flow are not acceptable.
Basic Construction:
Horizontal Units shall have the following air flow arrangement: Left Inlet/Straight (Right)
Discharge as shown on the plans. Units will have factory installed hanger brackets with rubber
isolation grommets packaged separately. Vertical Units shall have one of the following air flow
arrangements: Back Return/Top Discharge, Front Return/Top Discharge, Back Return/Front
Discharge, Front Return/Back Discharge as shown on the plans (GLV300 is top discharge only).
If units with these arrangements are not used, the contractor is responsible for any extra costs
incurred by other trades. All units (horizontal and vertical) must have a minimum of two access
panels for serviceability of compressor compartment. Units having only one access panel to
compressor/heat exchangers/expansion device/refrigerant piping shall not be acceptable.
The heat pumps shall be fabricated from heavy gauge galvanized steel. All interior surfaces shall
be lined with 1/2 inch (12.7mm) thick, dual density, 1-3/4 lb/ft3 (28 kg/m3) acoustic type glass
fiber insulation. Insulation placement shall be designed in a manner that will eliminate any
exposed edges to prevent the introduction of glass fibers into the air stream.
Vertical heat pumps shall be fabricated from heavy gauge galvanized steel with powder coat
paint finish. The color will be Polar Ice. Both sides of the steel shall be painted for added
protection.
Standard cabinet panel insulation must meet NFPA 90A requirements, air erosion and mold
growth limits of UL-181, stringent fungal resistance test per ASTM-C1071 and ASTM G21, and
shall meet zero level bacteria growth per ASTM G22. Unit insulation must meet these stringent
requirements or unit(s) will not be accepted.
All horizontal units to have factory installed 1” (25.4mm) discharge air duct collars, 1”
(25.4mm) filter rails with 1” (25.4mm) filters factory installed, and factory installed unitmounting brackets. Vertical units to have field installed discharge air duct collar, shipped loose
and 1” (25.4mm) filter rails with 1” (25.4mm) filters factory installed. If units with these
factory installed provisions are not used, the contractor is responsible for any extra costs to
field install these provisions, and/or the extra costs for his sub-contractor to install these
provisions.
All units must have an insulated panel separating the fan compartment from the compressor
compartment. Units with the compressor in the air stream are not acceptable. Units shall have a
factory installed 1 inch (25.4mm) wide filter bracket for filter removal from either side. Units
shall have a 1 inch (25.4mm) thick throwaway type glass fiber filter. The contractor shall
purchase one spare set of filters and replace factory shipped filters on completion of start-up.
Filters shall be standard sizes. If units utilize non-standard filter sizes then the contractor shall
provide 12 spare filters for each unit.
Cabinets shall have separate holes and knockouts for entrance of line voltage and low voltage
control wiring. All factory-installed wiring passing through factory knockouts and openings shall
be protected from sheet metal edges at openings by plastic ferrules. Supply and return water
connections shall be copper IPT fittings, and shall be securely mounted flush to the cabinet
corner post allowing for connection to a flexible hose without the use of a back-up wrench.
Water connections that protrude through the cabinet or require the use of a backup wrench shall
not be allowed. All water connections and electrical knockouts must be in the compressor
compartment corner post as to not interfere with the serviceability of unit. Contractor shall be
responsible for any extra costs involved in the installation of units that do not have this feature.
Contractor must ensure that units can be easily removed for servicing and coordinate locations of
electrical conduit and lights with the electrical contractor.
Option: Contractor shall install 2-inch (50.8mm) filter brackets and 2 inch(50.8mm) glass fiber
throwaway filters on all units.
Option: UltraQuiet package shall consist of high technology sound attenuating material that is
strategically applied to the compressor and air handling compartment casings and fan scroll in
addition to the standard ClimaQuiet system design, to further dampen and attenuate sound
transmissions.
Option: The unit will be supplied with cupro nickel coaxial water to refrigerant heat exchanger.
Option: The unit shall be supplied with extended range Insulation option, which adds closed cell
insulation to internal water lines, and provides insulation on suction side refrigeration tubing
including refrigerant to water heat exchanger.
Option: The refrigerant to air heat exchanger shall be “electro-coated” with a low cure cathodic
epoxy material a minimum of 0.4 mils thick (0.4 – 1.5 mils range) on all surfaces. The black
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colored coating shall provide a minimum of 1000 hours salt spray protection per ASTM B117-97
on all galvanized end plates and copper tubing, and a minimum of 2000 hours of salt spray on
all aluminum fins. The material shall be formulated without the inclusion of any heavy metals
and shall exhibit a pencil hardness of 2H (ASTM D3363-92A), crosshatch adhesion of 4B-5B
(ASTM D3359-95), and impact resistance of 160 in-lbs (184 kg-cm) direct (ASTM D2794-93).
Option (vertical units only): Unit shall include ClimaDry reheat option. Only modulating reheat
that will adjust capacity based upon supply air temperature to provide “neutral” (72ºF, 22.2ºC)
constant air temperature will be accepted. “Neutral” supply air temperature shall be provided
regardless of entering loop water temperatures (above 55ºF, 12.8ºC) or refrigerant condensing
pressures. Control of reheat must be accomplished via a humidistat or dehumidistat contact
closure. Refrigerant circuit must be ARI certified. Approved equal manufacturers may provide
pre-engineered integrated modulating hot gas reheat within the unit cabinet, or the installing
contractor in conjunction with the “approved equal” unit manufacturer can provide for
approval (during the submittal phase) an engineered system consisting of: a duct mounted hot
water coil, small circulating pump, modulating control valve, and associated piping using the
discharge condenser water off of the unit as the heating medium. All design costs and costs of
field installed items including additional power wiring to pump, and control wiring to and from
pump and control valve to unit shall be borne by mechanical contractor. Refrigerant circuits
that are not ARI certified when the reheat option is applied will not be accepted. (See
ClimaDry submittal for more details and unit availability.)
Fan and Motor Assembly:
All units shall have belt-driven single or dual centrifugal fans. Fan motors shall be permanently
lubricated with thermal overload protection. Units supplied without permanently lubricated
motors must provide external oilers for easy service. The fan motor shall be isolated from the fan
housing by flexible rubber type isolation grommets. The fan and motor assembly must be
capable of overcoming the external static pressures as shown on the schedule. Airflow / Static
pressure rating of the unit shall be based on a wet coil and a clean filter in place. Ratings based
on a dry coil and/or no filter, or on an ESP less than 0.25” (6.35 mm w.g.) shall NOT be
acceptable.
Option: Various blower drive packages for selectable static pressure/airflow.
Refrigerant Circuit:
Units shall have two sealed refrigerant circuits, each including a high efficiency scroll
compressor (only GLH 072 utilizes reciprocating compressors) designed for heat pump
operation, a thermostatic expansion valve for refrigerant metering, an enhanced corrugated
lanced fin and rifled copper tube refrigerant to air heat exchanger, reversing valve, coaxial (tube
in tube) refrigerant to water heat exchanger, and safety controls including a high pressure switch,
low pressure switch (loss of charge), water coil low temperature sensor, and air coil low
temperature sensor. Access fittings shall be factory installed on high and low pressure
refrigerant lines to facilitate field service. Activation of any safety device shall prevent
compressor operation via a microprocessor lockout circuit. The lockout circuit shall be reset at
the thermostat or at the contractor supplied disconnect switch. Units that cannot be reset at the
thermostat shall not be acceptable.
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Hermetic compressors shall be internally sprung. The scroll compressors (only GLH072 utilizes
reciprocating compressors) shall have a dual level vibration isolation system. The compressor(s)
will be mounted on computer selected vibration isolation grommets to a large heavy gauge
compressor mounting tray plate, which is then isolated from the cabinet base with rubber
grommets for maximized vibration attenuation. Compressor shall have thermal overload
protection. Compressor shall be located in an insulated compartment away from air stream to
minimize sound transmission.
Refrigerant to air heat exchangers shall utilize enhanced corrugated lanced aluminum fins and
rifled copper tube construction rated to withstand 450 PSIG (3101 kPa) refrigerant working
pressure. Refrigerant to water heat exchangers shall be of copper inner water tube and steel
refrigerant outer tube design, rated to withstand 450 PSIG (3101 kPa) working refrigerant
pressure and 450 PSIG (3101 kPa) working water pressure. The refrigerant to water heat
exchanger shall be “electro-coated” with a low cure cathodic epoxy material a minimum of 0.4
mils thick (0.4 – 1.5 mils range) on all surfaces. The black colored coating shall provide a
minimum of 1000 hours salt spray protection per ASTM B117-97 on all external steel and
copper tubing. The material shall be formulated without the inclusion of any heavy metals and
shall exhibit a pencil hardness of 2H (ASTM D3363-92A), crosshatch adhesion of 4B-5B
(ASTM D3359-95), and impact resistance of 160 in-lbs (184 kg-cm) direct (ASTM D2794-93).
Plate to plate heat exchangers are not acceptable.
Refrigerant metering shall be accomplished by thermostatic expansion valve only. Expansion
valves shall be dual port balanced types with external equalizer for optimum refrigerant
metering. Units shall be designed and tested for operating ranges of entering water temperatures
from 20° to 110°F (-6.7° to 43.3°C). Reversing valve shall be four-way solenoid activated
refrigerant valve, which shall default to heating mode should the solenoid fail to function. If the
reversing valve solenoid defaults to cooling mode, an additional low temperature thermostat
must be provided to prevent over-cooling an already cold room.
Drain Pan:
The drain pan shall be constructed of galvanized steel and have a powder coat paint application
to further inhibit corrosion. This corrosion protection system shall meet the stringent 1000 hour
salt spray test per ASTM B117. If plastic type material is used, it must be HDPE (High Density
Polyethylene) to avoid thermal cycling shock stress failure over the lifetime of the unit. Stainless
Steel materials are also acceptable. Drain pan shall be fully insulated. Drain outlet shall be
located at pan as to allow complete and unobstructed drainage of condensate. Drain outlet for
shall be connected from pan directly to IPT fitting. No hidden internal tubing extensions from
pan outlet extending to unit casing (that can create drainage problems) will be accepted. The
unit as standard will be supplied with solid-state electronic condensate overflow protection.
Mechanical float switches will NOT be accepted.
Electrical:
A control box shall be located within the unit compressor compartment and shall contain a 75VA
transformer with load side circuit breaker protection, 24 volt activated, 2 or 3 pole compressor
contactor, terminal block for thermostat wiring and solid-state controller for complete unit
operation. Reversing valve and fan motor wiring shall be routed through this electronic
controller. Units shall be name-plated for use with time delay fuses or HACR circuit breakers.
Unit controls shall be 24 Volt and provide heating or cooling as required by the remote
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thermostat / sensor. Two compressor units shall have a solid-state time delay relay and random
start to prevent both compressors from starting simultaneously.
Solid State Control System (CXM):
Units shall have a solid-state control system. Units utilizing electro-mechanical control shall
not be acceptable. The control system microprocessor board shall be specifically designed to
protect against building electrical system noise contamination, EMI, and RFI interference. The
control system shall interface with a heat pump type thermostat. The control system shall have
the following features:
a.
b.
c.
d.
e.
f.
g.
h.
i.
j.
k.
l.
m.
n.
o.
p.
Anti-short cycle time delay on compressor operation.
Random start on power up mode.
Low voltage protection.
High voltage protection.
Unit shutdown on high or low refrigerant pressures.
Unit shutdown on low water temperature.
Condensate overflow electronic protection.
Option to reset unit at thermostat or disconnect.
Automatic intelligent reset. Unit shall automatically reset the unit 5 minutes after trip
if the fault has cleared. If a fault occurs 3 times sequentially without thermostat
meeting temperature, then lockout requiring manual reset will occur.
Ability to defeat time delays for servicing.
Light emitting diode (LED) on circuit board to indicate high pressure, low pressure,
low voltage, high voltage, low water/air temperature cut-out, condensate overflow,
and control voltage status.
The low-pressure switch shall not be monitored for the first 120 seconds after a
compressor start command to prevent nuisance safety trips.
24V output to cycle a motorized water valve or other device with compressor
contactor.
Unit Performance Sentinel (UPS). The UPS warns when the heat pump is running
inefficiently.
Water coil low temperature sensing (selectable for water or anti-freeze).
Air coil low temperature sensing.
NOTE: Units not providing the 8 safety protections of anti-short cycle, low voltage, high
voltage, high refrigerant pressure, low pressure (loss of charge), air coil low temperature cutout, water coil low temperature cut-out, and condensate overflow protections will not be
accepted.
Option: Enhanced solid state control system (DXM)
This control system features two stage control of cooling and two stage control of heating modes
for exacting temperature and dehumidification purposes. Control shall have all of the above
mentioned features of the CXM control system along with the following expanded features:
a.
b.
c.
d.
Removable thermostat connector.
Night setback control.
Random start on return from night setback.
Minimized reversing valve operation (Unit control logic shall only switch the
reversing valve when cooling is demanded for the first time. The reversing valve
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e.
f.
g.
h.
i.
j.
k.
l.
m.
n.
o.
shall be held in this position until the first call for heating, ensuring quiet operation
and increased valve life.).
Override temperature control with 2-hour (adjustable) timer for room occupant to
override setback temperature at the thermostat.
Dry contact night setback output for digital night setback thermostats.
Ability to work with heat pump or heat/cool (Y, W) type thermostats.
Ability to work with heat pump thermostats using O or B reversing valve control.
Emergency shutdown contacts.
Boilerless system heat control at low loop water temperature.
Ability to allow up to 3 units to be controlled by one thermostat.
Relay to operate an external damper.
Ability to automatically change fan speed from multistage thermostat.
Relay to start system pump.
75 VA control transformer. Control transformer shall have load side short circuit and
overload protection via a built in circuit breaker.
Remote Service Sentinel (CXM/DXM):
Solid state control system shall communicate with thermostat to display (at the thermostat) the
unit status, fault status, and specific fault condition, as well as retrieve previously stored fault
that caused unit shutdown. The Remote Service Sentinel allows building maintenance personnel
or service personnel to diagnose unit from the wall thermostat. The control board shall provide a
signal to the thermostat fault light, indicating a lockout. Upon cycling the G (fan) input 3 times
within a 60 second time period, the fault light shall display the specific code as indicated by a
sequence of flashes. A detailed flashing code shall be provided at the thermostat LED to display
unit status and specific fault status such as over/under voltage fault, high pressure fault, low
pressure fault, low water temperature fault, condensate overflow fault, etc. Units that do not
provide this remote service sentinel shall not be acceptable.
Option: Lonworks interface system
Units shall have all the features listed above (either CXM or DXM) and the control board will be
supplied with a LONWORKS interface board, which is LONMark certified. This will permit all
units to be daisy chained via a 2-wire twisted pair shielded cable. The following points must be
available at a central or remote computer location:
a. space temperature
b. leaving water temperature
c. discharge air temperature
d. command of space temperature setpoint
e. cooling status
f. heating status
g. low temperature sensor alarm
h. low pressure sensor alarm
i. high pressure switch alarm
j. condensate sensor alarm
k. hi/low voltage alarm
l. fan "ON/AUTO" position of space thermostat as specified above
m. unoccupied / occupied command
n. cooling command
o. heating command
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p. fan "ON / AUTO" command
q. fault reset command
r. itemized fault code revealing reason for specific shutdown fault (any one of 7)
This option also provides the upgraded 75VA control transformer with load side short circuit and
overload protection via a built in circuit breaker.
Option: MPC (Multiple Protocol Control) interface system
Units shall have all the features listed above (either CXM or DXM) and the control board will be
supplied with a Multiple Protocol interface board. Available protocols are BACnet MS/TP,
Modbus, or Johnson Controls N2. The choice of protocol shall be field selectable/changeable via
the use of a simple selector switch. Protocol selection shall not require any additional
programming or special external hardware or software tools. This will permit all units to be
daisy chain connected by a 2-wire twisted pair shielded cable. The following points must be
available at a central or remote computer location:
a. space temperature
b. leaving water temperature
c. discharge air temperature
d. command of space temperature setpoint
e. cooling status
f. heating status
g. low temperature sensor alarm
h. low pressure sensor alarm
i. high pressure switch alarm
j. condensate overflow alarm
k. hi/low voltage alarm
l. fan "ON/AUTO" position of space thermostat as specified above
m. unoccupied / occupied command
n. cooling command
o. heating command
p. fan "ON / AUTO" command
q. fault reset command
r. itemized fault code revealing reason for specific shutdown fault (any one of 7)
This option also provides the upgraded 75VA control transformer with load side short circuit and
overload protection via a built in circuit breaker.
Warranty:
Climate Master shall warranty equipment for a period of 12 months from start up or 18 months
from shipping (which ever occurs first).
Option: Extended 4-year compressor warranty covers compressor for a total of 5 years.
Option: Extended 4-year refrigeration circuit warranty covers coils, reversing valve, expansion
valve and compressor for a total of 5 years.
Option: Extended 4-year control board warranty covers the CXM/DXM control board for a total
of 5 years.
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FIELD INSTALLED OPTIONS
Hose Kits:
All units 120000 BTUH (35 kW) and below shall be connected with hoses. The hoses shall be 2
feet (61cm) long, braided stainless steel; fire rated hoses complete with adapters. Only fire rated
hoses will be accepted.
Valves:
The following valves are available and will be shipped loose:
a. Ball valve; bronze material, standard port full flow design, IPT connections.
b. Ball valve with memory stop and PT Port; standard port full flow design, IPT
connections.
c. “Y” strainer with cap; bronze material, IPT connections.
d. “Y” strainer with blowdown valve; bronze material, IPT connections.
e. Motorized water valve; slow acting, 24v, IPT connections.
Hose Kit Assemblies:
The following assemblies ship with the valves already assembled to the hose described:
a. Supply and return hoses having ball valve with PT port.
b. Supply hose having ball valve with PT port; return hose having automatic flow
regulator valve (Measureflo) with PT ports, and ball valve.
c. Supply hose having “Y” strainer with blowdown valve, and ball valve with PT port;
return hose having automatic flow regulator (Measureflo) with PT ports, and ball
valve.
Thermostats:
The thermostat shall be a ClimateMaster mechanical or electronic type thermostat as selected
below with the described features:
a. Single Stage Standard Manual Changeover (ATM11C01)
Thermostat shall be a single-stage, vertical mount, manual changeover with HEATOFF-COOL system switch and fan ON-AUTO switch. Thermostat shall have a
mechanical temperature indicator and set point indication. Thermostat shall only
require 4 wires for connection. Mercury bulb thermostats are not acceptable.
b. Single Stage Digital Manual Changeover with Two-Speed Fan Control (ATM11C03)
– DXM and PSC Fan required
Thermostat shall be a single-stage, digital, manual changeover with HEAT-OFFCOOL system switch, fan ON-AUTO switch, and fan LO-HI switch. Thermostat
shall have an LCD display with temperature and set-point(s) in ºF or ºC. The
Thermostat shall provide permanent memory of set-point(s) without batteries. A fault
LED shall be provided to display specific fault condition. Thermostat shall come
standard with remote temperature sensor, but may be operated with internal sensor if
desired via installation of a jumper.
c. Single Stage Digital Auto or Manual Changeover (ATA11U01)
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d.
e.
f.
g.
h.
Thermostat shall be a single-stage, digital, auto or manual changeover with HEATOFF-COOL-AUTO system switch and fan ON-AUTO switch. Thermostat shall have
an LCD display with temperature and set-point(s) in ºF or ºC. The Thermostat shall
provide permanent memory of set-point(s) without batteries. A fault LED shall be
provided to display specific fault condition. Thermostat shall provide temperature
display offset for custom applications.
Single Stage Digital Automatic Changeover with Two-Speed Fan Control
(ATA11C04) – DXM and PSC Fan required
Thermostat shall be a single-stage, digital, auto or manual changeover with HEATOFF-COOL-AUTO system switch, fan ON-AUTO switch, and fan LO-HI switch.
Thermostat shall have an LCD display with temperature and set-point(s) in ºF or ºC.
The Thermostat shall provide permanent memory of set-point(s) without batteries. A
fault LED shall be provided to display specific fault condition. Thermostat shall
come standard with remote temperature sensor, but may be operated with internal
sensor if desired via installation of a jumper.
Multistage Digital Automatic Changeover (ATA22U01)
Thermostat shall be multi-stage (2H/2C), manual or automatic changeover with
HEAT-OFF-COOL-AUTO system settings and fan ON-AUTO settings. Thermostat
shall have an LCD display with temperature, set-point(s), mode, and status indication.
The temperature indication shall be selectable for ºF or ºC. The thermostat shall
provide permanent memory of set-point(s) without batteries. A fault LED shall be
provided to indicate specific fault condition(s). Thermostat shall provide temperature
display offset for custom applications. Thermostat shall allow unit to provide better
dehumidification with optional DXM controller by automatically using lower fan
speed on stage 1 cooling (higher latent cooling) as main cooling mode, and
automatically shifting to high speed fan on stage 2 cooling.
Single Stage Manual Changeover Programmable 5/2 Day (ATP11N01)
Thermostat shall be 5 day/2 day programmable (with up to 4 set points per day),
single stage (1H/1C), manual changeover with HEAT-OFF-COOL system settings
and fan ON-AUTO settings. Thermostat shall have an LCD display with
temperature, set-point(s), mode, and status indication. The temperature indication
shall be selectable for ºF or ºC. The thermostat shall provide permanent memory of
set-point(s) without batteries. Thermostat shall provide convenient override feature
to temporarily change set point.
Multistage Automatic or Manual Changeover Programmable 5/2 Day (ATP21U01)
Thermostat shall be 5 day/2 day programmable (with up to 4 set points per day),
multi-stage (2H/1C), automatic or manual changeover with HEAT-OFF-COOLAUTO system settings and fan ON-AUTO settings. Thermostat shall have an LCD
display with temperature, set-point(s), mode, and status indication. The temperature
indication shall be selectable for ºF or ºC. The thermostat shall provide permanent
memory of set-point(s) without batteries. Thermostat shall provide convenient
override feature to temporarily change set point.
Multistage Automatic or Manual Changeover Programmable 7 Day (ATP32U01)
Thermostat shall be 7 day programmable (with up to 4 set points per day), multi-stage
(3H/2C), automatic or manual changeover with HEAT-OFF-COOL-AUTO system
settings and fan ON-AUTO settings. Thermostat shall have a blue backlit dot matrix
LCD display with temperature, set-points, mode, and status indication. The
temperature indication shall be selectable for ºF or ºC. Time display shall be
selectable for 12 or 24 hour clock. Fault identification shall be provided (when used
with ClimateMaster CXM or DXM controls) to simplify troubleshooting by providing
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specific unit fault at the thermostat with red backlit LCD during unit lockout. The
thermostat shall provide permanent memory of set-points without batteries.
Thermostat shall provide heating set-point range limit, cooling set-point range limit,
temperature display offset, keypad lockout, dead-band range setting, and inter-stage
differential settings. Thermostat shall provide progressive recovery to anticipate time
required to bring space temperature to the next programmed event. Thermostat shall
provide an installer setup for configuring options and for setup of servicing contractor
name and contact information. Thermostat shall allow the use of an accessory remote
and/or outdoor temperature sensor (AST008). Thermostat navigation shall be
accomplished via five buttons (up/down/right/left/select) with menu-driven selections
for ease of use and programming.
i. Multistage Automatic or Manual Changeover Programmable 7 Day with Humidity
Control (ATP32U02)
Thermostat shall be 7 day programmable (with up to 4 set points per day), multi-stage
(3H/2C), automatic or manual changeover with HEAT-OFF-COOL-AUTO system
settings and fan ON-AUTO settings. Separate dehumidification and humidification
set points shall be configurable for discreet outputs to a dehumidification option
and/or an external humidifier. Installer configuration mode shall allow thermostat
dehumidification mode to operate with ClimaDry reheat or with ECM fan
dehumidification mode via settings changes. Thermostat shall have a blue backlit dot
matrix LCD display with temperature, relative humidity, set-points, mode, and status
indication. The temperature indication shall be selectable for ºF or ºC. Time display
shall be selectable for 12 or 24 hour clock. Fault identification shall be provided
(when used with ClimateMaster CXM or DXM controls) to simplify troubleshooting
by providing specific unit fault at the thermostat with red backlit LCD during unit
lockout. The thermostat shall provide permanent memory of set-points without
batteries. Thermostat shall provide heating set-point range limit, cooling set-point
range limit, temperature display offset, keypad lockout, dead-band range setting, and
inter-stage differential settings. Thermostat shall provide progressive recovery to
anticipate time required to bring space temperature to the next programmed event.
Thermostat shall provide an installer setup for configuring options and for setup of
servicing contractor name and contact information. Thermostat shall allow the use of
an accessory remote and/or outdoor temperature sensor (AST008). Thermostat
navigation shall be accomplished via five buttons (up/down/right/left/select) with
menu-driven selections for ease of use and programming.
DDC Sensors:
ClimateMaster wall mounted DDC sensor to monitor room temperature and interfaces with
optional interface system described above. Several types as described below:
a. Sensor only with no display (LON and MPC).
b. Sensor with override (LON only).
c. Sensor with setpoint and adjustment override (MPC only).
d. Sensor with setpoint and adjustment override, LCD display, status/fault indication
(LON and MPC).
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